Originally Posted by caltek1

Yes the Tamiya motor heatsink for the MO3 will fit the MO5, or just use the 3Racing one that has been made for the MO5. The Tamiya heatsink requires no modification, however the 3Racing does require two of the front fins to be filed back if using the Tamiya MO5 alloy knuckles. However if you are racing TCS then I suppose the 3Racing is not legal.

Calvin.